main feature

●Original high-speed optocoupler, good stability and fast speed, classic and reliable optocoupler isolation circuit. FT232RL main control, the industry's outstanding USB-to-serial chip, the stable choice for industrial applications.

●Original high-speed optocoupler, good stability and fast speed, classic and reliable optocoupler isolation circuit.

●Original high-speed optocoupler, good stability and fast speed, classic and reliable optocoupler isolation circuit. The on-board large-spacing isolated power supply does not require external power supply, and it can be used as long as it is inserted into the USB interface.

●Original high-speed optocoupler, good stability and fast speed, classic and reliable optocoupler isolation circuit. Increase the isolation gap and slot the PCB to better avoid creepage and improve safety performance.

●Integrated protection diode to improve protection capability.

●Original high-speed optocoupler, good stability and fast speed, classic and reliable optocoupler isolation circuit. USB-A male interface, no need for a cable, it can be directly inserted into the USB port of the computer to use.

●The communication level can be conveniently switched to 5V or 3.3V through the jumper cap.

●Original high-speed optocoupler, good stability and fast speed, classic and reliable optocoupler isolation circuit. VCC can output voltage 5V or 3.3V, and the communication level and VCC can be the same or different.

●Original high-speed optocoupler, good stability and fast speed, classic and reliable optocoupler isolation circuit. TX leads to TX-D (open-drain output) through the reverse diode, which is convenient for programming STC microcontroller and avoids the failure of incomplete programming after power failure.

●Original high-speed optocoupler, good stability and fast speed, classic and reliable optocoupler isolation circuit. On-board power supply, sending and receiving three LED indicators, observe the communication status at any time (dedicated IO driver, not parallel to the signal line, does not affect the communication).

typical application

●Isolated USB to TTL serial communication and debugging equipment in the case of high voltage danger.

●Upgrade the firmware of peripherals such as routers and set-top boxes.

● Burn (download) MCU program

●High-speed USB UART communication (up to 2Mbps)

●Built in the product to improve communication reliability

pin function

●Level selection pin: used to select signal and power supply VCC pin level, must be connected to one of 5V or 3.3V.

●TX/RX: serial data pins (refer to the module's own TX. data transmission/RX. data reception, corresponding to the RX/TX of external devices.)

GND: power ground (GND must be connected, and must not be connected incorrectly, otherwise it may damage the device or serial port module)

The above are the pins that must be connected for normal communication.

VCC: power output (depending on whether the external device needs power supply to determine whether to connect or not, the maximum current should not exceed 150mA)

●TX-D: TX through the reverse diode, that is, the TX signal output by open-drain, can only output low level, and needs to be pulled high externally. When the STC microcontroller downloads the program, use TX-D instead of TX and connect it to the P30 pin of the MCU.

hint

●This module can support the simultaneous switching of signal pins and power pins to 5V/3.3V (using VCC for external power supply, the signal pin and VCC level are the same), and can also support different levels of signal and power supply (using 5V or 3.3V) V pin external power supply).

●In the factory test, the default level is 3.3V. TX/RX are directly connected and can be removed when using.

Precautions

●This is a 5V/3.3V TTL level serial port, please do not connect RS-232 level devices (+-5V to +-15V)

●The load of this module should not exceed 150mA, otherwise the module or the computer USB will be damaged by overloading (only three lines of GND/TX/RX are required for communication).